Smith & Wesson J Frame Model 640 Cylinder Assembly - Stainless Steel .38 Special - Used OEM Part 64063 thumbpiece 375" wide Spur 357 Magnum

375" wide  Spur 357 Magnum

and sight-in adjustment are required

Part Number: 412130000

Model: Model 14 (K-38 Masterpiece)

Model 66-6

Smith & Wesson J Frame Model 640 Cylinder Assembly - Stainless Steel .38 Special - Used OEM Part 64063 thumbpiece 375" wide Spur 357 Magnum64063 Smith & Wesson J Frame Model 640 Used Cylinder Assembly . 38 Special Email or call us for your Smith and Wesson gun part needs! How to determine the model number of your Smith & Wesson Revolver. Swing out the cylinder , check behind the yoke on the frame for a MODEL NUMBER. Model numbers began in 1957 58. So if there is no model number then your revolver may be older than 1957 58. In this case we can possibly still find the part you need with